Liquid Helium Research Dewars

Janis Research designs and manufactures a line of superior quality research dewars. With a wide range of styles and options available, there is sure to be a dewar to suit your application.
Dewars are available with a demountable bottom flange for the easy addition of an optical or non-optical tail set. If this option is not required, then dewars are available with a welded bottom flange. All joints are leak-checked warm and cold to ensure that Janis Research's standard of high quality is maintained.

Both liquid nitrogen and vapor-shielded dewars are available, and all dewars have been designed to minimize liquid helium consumption. Mounting flanges are available, with the style of flange depending on the size of the dewar.

Following is a list of standard sizes and designs. Variations on these dewars, or a completely custom dewar, may easily be ordered by discussing your application with our experienced design engineers. Contact Janis today for further details.

Liquid Helium Research Dewars by Janis Research

Table of Contents
CNDT Dewars
Designed with SuperVariTemp inserts or immersion inserts in mind, these
dewars have demountable bottom flanges allowing easy installation of
the desired tail set. They have a completely enclosed liquid nitrogen
reservoir for increased cryogen efficiency, and are available in sizes
ranging from those suitable for small variable temperature inserts up to
those accommodating large diameter superconducting magnets.
CNDT-NMR Dewars
Similar to the standard CNDT dewar, but custom designed for NMR
Spectroscopy. The sample space is maximized while still allowing
the tail to fit inside the bore of your magnet.
CNDT-UHV Dewars
Similar to the standard CNDT dewar, but custom designed for UHV
applications. This dewar is built to order, so the dimensions, cryogen
volume, conflat flange and cold plate tapped hole pattern may all be
specified to meet any individual requirements.
RD Dewars (Liquid Nitrogen Shielded)
These bucket style dewars are suitable for superconducting magnets
and other non-optical inserts.
CNRD Dewars (Liquid Nitrogen Shielded)
Similar to the RD dewars, these dewars have a completely enclosed liquid
nitrogen reservoir for increased cryogen efficiency and are available in a
wide range of sizes.
VSRD Dewars (Vapor Shielded)
These convenient bucket style dewars need no liquid nitrogen for
operation, and are suitable for use with superconducting magnets and
other non-optical inserts.

Storage Dewars
Janis stocks a complete line of liquid helium storage dewars
which feature a wide neck made of composite material for
high performance.

JANIS RESEARCH COMPANY, INC.
2 Jewel Drive, P.O. Box 696
Wilmington, MA 01887-0696 USA
TEL: +1-978-657-8750 FAX: +1-978-658-0349
E-Mail: sales@janis.com
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